/*
 * Copyright (c) 2015-2020, www.dibo.ltd (service@dibo.ltd).
 * <p>
 * Licensed under the Apache License, Version 2.0 (the "License"); you may not
 * use this file except in compliance with the License. You may obtain a copy of
 * the License at
 * <p>
 * https://www.apache.org/licenses/LICENSE-2.0
 * <p>
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
 * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
 * License for the specific language governing permissions and limitations under
 * the License.
 */
package com.icesoft.framework.core.binding.binder;

import com.icesoft.framework.core.binding.annotation.BindEntityList;
import com.icesoft.framework.core.binding.binder.remote.RemoteBindingManager;
import com.icesoft.framework.core.binding.helper.ResultAssembler;
import com.icesoft.framework.core.config.Cons;
import com.icesoft.framework.core.exception.InvalidUsageException;
import com.icesoft.framework.core.util.BeanUtils;
import com.icesoft.framework.core.util.S;
import com.icesoft.framework.core.util.V;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

import java.util.*;

/**
 * Entity集合绑定实现
 */
public class EntityListBinder<T> extends EntityBinder<T> {
	private static final Logger log = LoggerFactory.getLogger(EntityListBinder.class);

	/***
	 * 构造方法
	 * @param annotation
	 * @param voList
	 */
	public EntityListBinder(BindEntityList annotation, List voList) {
		super(annotation.entity(), voList);
		if (V.notEmpty(annotation.splitBy())) {
			this.splitBy = annotation.splitBy();
		}
		if (V.notEmpty(annotation.orderBy())) {
			this.orderBy = annotation.orderBy();
		}
	}

	/***
	 * 构造方法
	 * @param entityClass
	 * @param voList
	 */
	public EntityListBinder(Class<T> entityClass, List voList) {
		super(entityClass, voList);
	}

	@Override
	public void bind() {
		if (V.isEmpty(annoObjectList)) {
			return;
		}
		if (V.isEmpty(refObjJoinCols)) {
			throw new InvalidUsageException("调用错误：无法从condition中解析出字段关联.");
		}
		Map<String, List> valueEntityListMap = new HashMap<>();
		if (middleTable == null) {
			this.simplifySelectColumns();
			super.buildQueryWrapperJoinOn();
			// 查询条件为空时不进行查询
			if (queryWrapper.isEmptyOfNormal()) {
				return;
			}
			//处理orderBy，附加排序
			this.appendOrderBy(remoteBindDTO);
			List<T> entityList = null;
			// 查询entity列表: List<Role>
			if (V.isEmpty(this.module)) {
				// 本地查询获取匹配结果的entityList
				entityList = getEntityList(queryWrapper);
			} else {
				// 远程调用获取
				entityList = RemoteBindingManager.fetchEntityList(module, remoteBindDTO, referencedEntityClass);
			}
			if (V.notEmpty(entityList)) {
				valueEntityListMap = this.buildMatchKey2EntityListMap(entityList);
			}
			ResultAssembler.bindPropValue(annoObjectField, super.getMatchedAnnoObjectList(), getAnnoObjJoinFlds(), valueEntityListMap, this.splitBy);
		} else {
			if (refObjJoinCols.size() > 1) {
				throw new InvalidUsageException(NOT_SUPPORT_MSG);
			}
			// 提取注解条件中指定的对应的列表
			Map<String, List> trunkObjCol2ValuesMap = super.buildTrunkObjCol2ValuesMap();
			Map<String, List> middleTableResultMap = middleTable.executeOneToManyQuery(trunkObjCol2ValuesMap);
			if (V.isEmpty(middleTableResultMap)) {
				return;
			}
			this.simplifySelectColumns();
			// 收集查询结果values集合
			List entityIdList = extractIdValueFromMap(middleTableResultMap);
			if (V.notEmpty(this.splitBy)) {
				Class<?> fieldType = refObjPropInfo.getFieldTypeByColumn(refObjJoinCols.get(0));
				entityIdList = ResultAssembler.unpackValueList(entityIdList, this.splitBy, fieldType);
			}
			//处理orderBy，附加排序
			this.appendOrderBy(remoteBindDTO);
			// 构建查询条件
			String refObjJoinOnCol = refObjJoinCols.get(0);
			List<T> entityList = null;
			// 查询entity列表: List<Role>
			if (V.isEmpty(this.module)) {
				// 本地查询获取匹配结果的entityList
				queryWrapper.in(refObjJoinOnCol, entityIdList);
				entityList = getEntityList(queryWrapper);
			} else {
				// 远程调用获取
				remoteBindDTO.setRefJoinCol(refObjJoinOnCol).setInConditionValues(entityIdList);
				entityList = RemoteBindingManager.fetchEntityList(module, remoteBindDTO, referencedEntityClass);
			}
			if (V.isEmpty(entityList)) {
				return;
			}
			String refObjJoinOnField = toRefObjField(refObjJoinOnCol);
			// 转换entity列表为Map<ID, Entity>
			Map<String, List<T>> entityMap = BeanUtils.convertToStringKeyObjectListMap(entityList, refObjJoinOnField);
			for (Map.Entry<String, List> entry : middleTableResultMap.entrySet()) {
				// List<roleId>
				List annoObjFKList = entry.getValue();
				if (V.isEmpty(annoObjFKList)) {
					continue;
				}
				List valueList = new ArrayList();
				for (Object obj : annoObjFKList) {
					if (obj == null) {
						continue;
					}
					// 兼容JsonArray
					if (obj instanceof Collection) {
						for (Object key : (Collection) obj) {
							List<T> ent = entityMap.get(S.valueOf(key));
							if (ent != null) {
								for (T item : ent) {
									valueList.add(cloneOrConvertBean(item));
								}
							}
						}
					} else {
						String valStr = S.clearNonConst(String.valueOf(obj));
						List<T> ent = entityMap.get(valStr);
						if (ent != null) {
							for (T item : ent) {
								valueList.add(cloneOrConvertBean(item));
							}
						} else if (V.notEmpty(splitBy) && valStr.contains(splitBy)) {
							for (String key : valStr.split(splitBy)) {
								ent = entityMap.get(key);
								if (ent != null) {
									for (T item : ent) {
										valueList.add(cloneOrConvertBean(item));
									}
								}
							}
						}
					}
				}
				valueEntityListMap.put(entry.getKey(), valueList);
			}
			// 绑定结果
			ResultAssembler.bindEntityPropValue(annoObjectField, super.getMatchedAnnoObjectList(), middleTable.getTrunkObjColMapping(), valueEntityListMap, getAnnoObjColumnToFieldMap());
		}
	}

	/**
	 * 构建匹配key-entity目标的map
	 *
	 * @param list
	 * @return
	 */
	private Map<String, List> buildMatchKey2EntityListMap(List<T> list) {
		Map<String, List> key2TargetListMap = new HashMap<>(list.size());
		StringBuilder sb = new StringBuilder();
		for (T entity : list) {
			sb.setLength(0);
			for (int i = 0; i < refObjJoinCols.size(); i++) {
				String refObjJoinOnCol = refObjJoinCols.get(i);
				String pkValue = BeanUtils.getStringProperty(entity, toRefObjField(refObjJoinOnCol));
				if (i > 0) {
					sb.append(Cons.SEPARATOR_COMMA);
				}
				sb.append(pkValue);
			}
			// 查找匹配Key
			String matchKey = sb.toString();
			// 获取list
			List entityList = key2TargetListMap.get(matchKey);
			if (entityList == null) {
				entityList = new ArrayList<>();
				key2TargetListMap.put(matchKey, entityList);
			}
			Object target = entity;
			if (!(target instanceof Map)) {
				target = cloneOrConvertBean(entity);
			}
			entityList.add(target);
		}
		sb.setLength(0);
		return key2TargetListMap;
	}

}
